I've got a leak in the engine bay under the bulk head it's coming out of an elbow (that looks like an overflow). Could this be the A/C? Have checked all the engine levels they all seem ok. It is a 1.8 tdi, 2001.

surprise,not a tdci is it?. had nothing but problems with mine since i got it. kept running on 3 cylinders randomly, ford have now changed the engine and it seems ok for the moment.
Anyway sounds like you leak may be a/c related. if its under warranty get ford to have a look.

when the A/C has been working, there is water that is released by the system. This is normal. hope its that :)